Manganese-Coated TiO2 UV Particles to Limit Free Radicals
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Solution Overview
Problem
Current sunscreens containing titanium dioxide (TiO2) exhibit pro-oxidative properties when excited by UV radiation, leading to the formation of harmful free radicals, which can stress the skin and reduce their effectiveness in providing long-term protection against UV-A and UV-B radiation.
Innovation Solution
A particulate UV protection agent is developed with a manganese-containing coating, specifically a manganese oxide coating, applied to metal oxides like titanium dioxide through hydrothermal treatment, which reduces the pro-oxidative properties and enhances the sunscreen's stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium dioxide is used as a UV protection agent, then UV absorption is improved, but pro-oxidative properties are generated leading to skin stress
Solution Approach 1:
A manganese-containing coating layer is applied to the titanium dioxide particles to act as an intermediary between the TiO2 and the skin. This coating prevents direct interaction between UV-excited TiO2 and skin cells, blocking the generation and transfer of harmful free radicals while allowing UV absorption to continue. The manganese compounds serve as a protective mediator that eliminates the harmful pro-oxidative effects.
2Reliability
If titanium dioxide is micronised to improve UV absorption, then photoprotective properties are enhanced, but pro-oxidative action is increased
Solution Approach 1:
The solution applies a localized manganese-containing coating specifically to the surface of the micronized titanium dioxide particles. This creates a spatial differentiation where the core TiO2 maintains its high UV absorption capability due to micronization, while the surface coating locally suppresses free radical generation. The local quality change at the particle surface resolves the contradiction between enhanced UV protection and reduced pro-oxidative action.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The manganese-coated particulate UV protection agents improve UV absorption, photostability, and antioxidant properties, providing broader spectrum protection and increased storage stability, while minimizing skin stress and improving skin tolerance.
Implementation Method 1
titanium dioxide can have a pro-oxidative action after excitation by UV radiation and thus contribute to the formation of hydroxyl or peroxide free radicals
Implementation Method 2
the manganese-containing coating... reduces the pro-oxidative properties
Implementation Method 3
the UV protection essentially emanates from a particulate metal oxide... improve UV absorption
Implementation Method 4
the UV protection agent is obtainable by hydrothermal treatment of a particulate metal oxide and subsequent application of at least one coating
Data Source
AI summary
The present invention relates to particulate UV protection agents which are obtainable by hydrothermal treatment of a particulate metal oxide and subsequent application of a manganese oxide coating, and to the preparation and use thereof. The present invention furthermore relates to novel compositions, in particular for topical application, which are intended, in particular, for light protection of the skin and/or hair against UV radiation and free-radical-induced stress, and to the use thereof in the above-mentioned cosmetic application.